Case: Read the passage and answer the following questions

Protein structure is the three-dimensional arrangement of atoms in an amino acid-chain molecule. Proteins are polymers – specifically polypeptides – formed from sequences of amino acids, the monomers of the polymer. A single amino acid monomer may also be called a residue indicating a repeating unit of a polymer. A monopeptide has one amino acid. A dipeptide has two amino acids. A tripeptide has three amino acids. A tetrapeptide has four amino acids. The complete structure of a protein can be described at four different levels of complexity: primary, secondary, tertiary, and quaternary structure.

On what basis are fibrous and globular proteins classified?

Tertiary structure

Tertiary structure represents the overall folding of the polypeptide chains or the further folding of secondary structures. It gives rise to two major molecular shapes, i.e., fibrous and globular.